Rotary core drill



1,567,61 7 C. E. REED ROTARY com: DRILL Filed Dec. 18, 1922 2 :sheets-shea*b 1 Y um I.. ITE 5 1m w. w m n m um 9 mi Dec. 29, 1925 Patented Dec. Z2, i925.

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ROTARY CUBE DBLL.

Application filed December 18, 1922. lSerial No. 607,720.

To all whom t may concern: l

Be it known lthat l, CLARENCE E. Raro, a citiaen-ottheldnited States, and resident ot Houston, in the county of Harris and State oi 'llexas,rhave invented certain new and useful improvements in Rotary Core Drills, of which the Jfollowing is a. specilication. y

The invention consists in the features and combination and arrangement of parts here- 1@ inaiter described and particularly pointed out in the claims.

ln thedrawings Figure 1 shows the upper partei the apparatus partly in elevation and partly in central vertical section along the 15 plane oil the port 14 in Fig. 2, but with the lower end in section on line 1-1 of Figure 4.

Figure 2 is a cross section on, line 2-2 Figure 1.

ligure 3 2@ Figure 4.

Figure 4 is a bottom plan view.

Figure 5 is a part elevation and part sectional view of the cutter head showing a cutter oi the milling type and with a modi- 25 lied disposition of flushing duid conduit.

Figure 6 is a vertical sectional view of another orrn of cutter head: at the right on line 6 and at the lower left on the line 6 and the part abovethis is a section on the line l@ 6" of Figure 7.

Figure 7 is a bottom plan view of Figure 6. ln these drawings the drill stem section y 1 is screwed into a coupling 3. The Adrill stem section 4 is screw threaded into the is a sectional View on line 3-3 l 855 lower part of this coupling. The drill head 6 is screw threaded onto the lower end of the drill section 4 at 5. This drill head carries lower cutters 7 and reamer cutters 8.

lt has' a central bore 9 which is closed by "m a plug 10 having a fish tail or other bit 10 at its lower end and an extension 11 which acts as a guide. This extension may be hollow. This plu is 'provided with screw threads at 12 w ich engage corresponding w screw threads in the bore of the cutter head.

The cutter head has attached thereto by screw threads at 13 a core tube 15 which extends coaxially with the drill stem section 4 and at its upper end is tted to the central n depending extension 2 of the upper plug 16.

This extension has a central bore communieating with cross ports '14 which in turn conneet with the exterior of the drill stem through the hollow screws 18 by which the plug 16 is secured to the coupling 3. These 55 cross ports vent the interior of the core tube, the ushing'luid entering through the ports and illing up this tube. The plug 16 is oi the form shown in Figure 2 providing passages 17 for the iiushing iiuid which passes 60 down through the annular space 2O between the core tube and the drill stem section 4, and thence by passages 19 Figure 3 in the drill head to points adjacent the cutters but on the exterior of the drill head so as not to interfere with the formation of the core. The apparatus is also provided with Valve members 21 hinged to pins 22 held by member 22 in radial openings '23 of the drill head. Thev purpose of the plug 1G is to close 7 l the core tube 15 and prevent it from receiving material at miscellaneous depths as the apparatusis being lowered to its work.

ln the operation of the apparatus rotary movement of the drill .will cause the lower plug 10 to unscrew from its seat in the drill head and the material cut by the cutters 7 will pass to the center and force' this plug up along the core tube and a central core of the material will thus be provided made up of that which is actually cut, and excluding other matter, it being lodged in the core tube below the plug which will inally'be arrested by coming against the upper plug which closes the core tube. Hydraulic packing is provided at 24. The hinged valves 21 will move inwardly and hold the core against falling down as the apparatus is withdrawn from the well. The venting of the interior of the core tube will prevent too rapid upward movement of the plug, because thls plug must, as it rises, expel this ushing water above it, from the tube.

The reamer cutters are held in pockets 25 of the drill head on journal pins 26. These may be dropped into place as shown in Figure 6 and held by the coupling 27 bearing on their eccentric headed upper ends 28 which rest in sockets in the drill head. The cutters may be of various forms, besides 10 those shown in Figure 1. Thus in Figure 5 the cutter 7* is in the form of a milling cutter screw threaded onto the lower reduced end 29 of the cutter head, or as shown in Figure 6, the cutters may be of roller form mounted as at 30 on inclined axes or as at 31 on horizontal axes or both forms may be used in the same head. The Hushing water conduits are inclined as indicated at 19.

In Fig. 6 the rollers which cut the bottom of the hole are illustrated as carried in the same, or one piece cutter head as the reaming cutters. In the commercial form the rollers which cut the bottom of the hole are preferably carried in a separate cutter head from the body carrying reamer cutters. The cutter head and reamer body are joined by screw thread similar to the illustration in Fig. 5 in which the type of cutter 7 a is screw threaded to tit 29.

Where elements are susceptible of being embodied in one and the same form of the device it is to be regarded that they are to be embodied if desired. Thus the coupling 27 and head of Fig. 6 might be used in the place of the cutter head of Fig. 1, or the cutters of Figs. 5, 6 and 7 may be used in Fi 1. The apparatus is used in connection wit deep well drilling operations to secure from the bottom of the well cores of material by which character of the strata may be ascertained.

I claim:

l. In apparatus of the class described, 'the combination of a drill stem, a core tube therein, a drill head having cutters, members for locking the c'orevin the core tube and pins to which said members are pivoted heldin radial sockets or openings of the drill head, substantially as described.

2. In combination a drill head, a drill stem in sections, a coupling between the sections, a plug having a central bore and a cross bore, hollow screws for holding the plug to the coupling, and in connection with the cross bore venting the interior of the plug, and a core tube connected with the plug and with its bore communicating with the bore of the plug, substantially as described.

In testimony whereof, I aiiix my signature.

CLARENCE E. REED. 

